- the variation of the amplitude of a carrier wave in accordance with the signal being broadcast
- a broadcasting system that uses this
amplitude modulationamplitude modulation
- The encoding of a carrier wave by varying its amplitude in accordance with an input signal.
- A broadcast system that uses amplitude modulation.
Compare frequency modulation
(plural amplitude modulations)
- (radio) A method of sending information by modifying (modulating) the intensity (amplitude) of a carrier wave. Commonly abbreviated AM.
amplitude modulation - Computer Definition
Varying the voltage of a carrier or a direct current in order to transmit analog or digital data. Amplitude modulation (AM) is the oldest method of transmitting human voice electronically. In an analog telephone conversation, the voice waves on both sides are modulating the voltage of the direct current loop connected to them by the telephone company. Modulate a Carrier Amplitude modulation (AM) is also widely used to alter a carrier wave to transmit data. For example, in AM radio, the voltage (amplitude) of a carrier with a fixed center frequency (the station's channel) is varied (modulated) by the analog audio signal. AM is also used for digital data. In quadrature amplitude modulation (QAM), both amplitude and phase modulation are used to create different binary states for transmission (see QAM). AM is also used to modulate light waves in optical fibers. See modulation and carrier.